fix(kuma-cp) stop components on leader election lost

[jakubdyszkiewicz]

Summary

We were not stopping leader components on the lost leader event.
This only affects Universal deployments, Kubernetes CP is killed when the leader is lost.

In a case when there are 2 instances (CP1, CP2)

1. CP1 is a leader, CP2 is not
2. Postgres is down
3. CP1 was still running leader components although there should be no leader in this case
4. CP1 has troubles connecting to Postgres but CP2 can connect
5. CP1 and CP2 is now a leader.

It's not that CP1 leader without Postgres connection can do much, but that should not be the case.

Documentation

• - no docs

Testing

• Unit tests - tested with E2E test
• E2E tests - added
• Manual testing on Universal
• Manual testing on Kubernetes - Kubernetes not affected

[bartsmykla]

lgtm

[codecov-commenter]

Codecov Report

Merging #2318 (cf9ea33) into master (d6d37cc) will increase coverage by 0.25%.
The diff coverage is 11.00%.

@@            Coverage Diff             @@
##           master    #2318      +/-   ##
==========================================
+ Coverage   50.78%   51.03%   +0.25%     
==========================================
  Files         870      875       +5     
  Lines       40541    40664     +123     
==========================================
+ Hits        20587    20754     +167     
+ Misses      17959    17887      -72     
- Partials     1995     2023      +28     

Impacted Files	Coverage Δ
pkg/plugins/runtime/universal/outbound/outbound.go	67.85% <ø> (+5.35%)	⬆️
test/e2e/resilience/leader_election_postgres.go	0.00% <0.00%> (ø)
test/framework/interface.go	0.00% <ø> (ø)
test/framework/k8s_cluster.go	0.00% <0.00%> (ø)
test/framework/k8s_clusters.go	0.00% <0.00%> (ø)
test/framework/k8s_controlplane.go	0.00% <0.00%> (ø)
test/framework/universal_cluster.go	0.00% <0.00%> (ø)
test/framework/universal_clusters.go	0.00% <0.00%> (ø)
test/framework/universal_controlplane.go	0.00% <0.00%> (ø)
pkg/core/runtime/component/component.go	76.19% <66.66%> (+4.76%)	⬆️
... and 27 more

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